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2017 ; 12
(1
): 101
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PIGO deficiency: palmoplantar keratoderma and novel mutations
#MMPMID28545593
Morren MA
; Jaeken J
; Visser G
; Salles I
; Van Geet C
; Simeoni I
; Turro E
; Freson K
Orphanet J Rare Dis
2017[May]; 12
(1
): 101
PMID28545593
show ga
BACKGROUND: Several genetic defects have been identified in the
glycosylphosphatidylinositol (GPI) anchor synthesis, including mutations in PIGO
encoding phosphatidylinositol glycan anchor biosynthesis class O protein. These
defects constitute a subgroup of the congenital disorders of glycosylation (CDG).
Seven patients from five families have been reported carrying variants in PIGO
that cause an autosomal recessive syndrome characterised by dysmorphism,
psychomotor disability, epilepsy and hyperphosphatasemia. METHODS: Whole exome
sequencing was performed in a boy with dysmorphism, psychomotor disability,
epilepsy, palmoplantar keratoderma, hyperphosphatasemia and platelet dysfunction
without a clinical bleeding phenotype. RESULTS: Two novel variants in PIGO were
detected. The missense variant encoding p. His871Pro was inherited from the boy's
father while the frameshift variant encoding p. Arg604ProfsTer40 was maternally
inherited. CONCLUSION: A boy with two novel PIGO variants is reported. The skin
phenotype and platelet dysfunction in this patient have not been described in
previously reported patients with PIGO deficiency but it is of course uncertain
whether these are caused by this disorder. The literature on PIGO deficiency is
reviewed.